Module 3.2 Flashcards
What is Archimedes’ Principle?
The upwards force acting on an object submerged in a fluid, is equal to the weight of the fluid is displaced.
What is Centre of Gravity?
The single point through which the object’s weight can be said to act.
What is Centre of mass?
The single point through which all the mass of an object can be said to act.
What is Couple?
Two equal and opposite parallel forces that act on an object through different lines of action. It has the effect of causing a rotation without translation.
What is Density?
The mass per unit volume of a material.
What is Drag?
The frictional force that an object experiences when moving through a fluid.
What is Equilibrium?
For an object to be equilibrium, both the resultant force and resultant moment acting on the object must be equal to 0.
What is Free-body diagram?
A diagram showing all the forces acting on an object. It is a good starting point to any mechanics problem.
What is Friction?
The resistive force produced when there is relative movement between two surfaces.
What is Moment of force?
The product of a force and the perpendicular distance from the line of action of the force to the pivot.
What is Newton?
The unit of force.
What is Newton’s second law?
The sum of the forces acting on an object is equal to the rate of change of momentum of the object. It is also expressed as the net force acting an object equaling the product of the object’s mass and acceleration.
What is Normal contact force?
The reaction force between an object and surface.
What is Pressure?
The force that a surface experiences per unit area. It is measured in Pascals (Pa)
What is Principle of moments?
For an object to be in equilibrium, the sum of the clockwise moments acting about a point must be equal to the sum of the anticlockwise moments acting about the point.
